>When I put it in my armpit, the reading goes up rapidly before it >slows down to about 36.65, but still goes up slowly and for a very very long >time by 0.01 degree increments. Why is this so? Any explanation and solution >to this problem? Well the problem is as I explained before - the probe has a thermal mass that has to be heated. This takes time to do and will follow an exponential curve like the voltage across a charging capacitor. If you are really trying to take measurements to 0.01C then every measurement will see a change, even when you enclose it under your armpit, as your body temperature will also go up and down, depending on how active you are. With a sensor that sensitive get to a point where you are sitting down and let the temperature stabilise - may take several minutes. Now stand up suddenly and see what the temperature does. The solution is to decide if you really need to measure to 0.01C. I suspect that measuring to 0.1C is really accurate enough, especially for the human body, if that is what your instrument is to measure. The only alternative if you have to measure more accurately is to decide if you can stand the time delay for the probe to settle to the accuracy you want. If not you will have to find a probe with lower thermal mass. -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads